Air Changes Per Hour

Air Changes per Hour

Determining the number of Air Changes Per Hour or (ACH) is crucial when choosing an air purification system. which model and how many units you will need for your air purification needs? The following data has been gathered from various sources. We continually look to ASHRE , the EPA, and Engineering websites for newly updated clean air information. The lists below shows engineering recommendations for the number of air changes needed  in specific buildings and rooms. Your needs may vary. We also include a table on required air changes per occupant. Using these charts you should be able to determine how much air purification you need. 

Air changes can be done by bringing in fresh outdoor air or by indoor air purification.  The combination of both air purification and makeup air is often a great answer. Remember these are only recommendations.  If you need more help planning the Indoor Air Quality for your business or home, please give the experts at LakeAir a call @ 800-558-9436.

Building / Room Recommended Air Changes Per Hour
All spaces in general 5 min
Arcades 12-16
Assembly halls 6-8
Attic spaces for cooling 12 – 15
Auditoriums 8 – 15
Bakeries 20 – 30
Banks 5 – 10
Bank Vaults 6
Barber Shops 10 – 14
Bars 20 – 30
Beauty Shops 18 24
Bedrooms 4 – 8
Boiler Rooms 15 – 20
Bowling Alleys 14 – 20
Cafeterias 12 – 15
Casino (non smoking) 14 – 18
Casino  (Smoking) 20 – 30
Classrooms (ART) 16-20
Classrooms (ages 5 and up) 12 – 16
Classrooms (science lab) 16 -20
Classrooms (shop classes) 16 -20
Churches 8 – 15
Cigar Lounges 20 – 30
Club rooms 12
Clubhouses 20 – 30
Coin-operated dry cleaner 24 -20
Coin-operated laundries 11-13
Cocktail Lounges 20 – 30
Computer Rooms 8 -12
Commercial dry cleaner 24 -30
Commercial Laundry 22-26
Conference Roomos 5 – 8
Court Houses 4 – 10
Day Care (ages up to 4) 14- 18
Dance halls 16-20
Dental Centers 8 – 12
Department Stores 6 – 10
Dining Halls 12 -15
Dining rooms (restaurants) 12
Dress Shops 6 – 10
Drug Shops 6 – 10
Dry Cleaners 6 – 20
Engine rooms 4 – 6
Factory buildings, ordinary 2 – 4
Factory buildings, with fumes or moisture 10 – 15
Fast Food 12 – 14
Fire Stations 4 – 10
Food Processing 10 – 25
Foundries 15 – 20
Galvanizing plants 20 – 30
Garages repair 20 – 30
Garages storage 4 – 6
Health Club 20 – 26
Homes, night cooling 10 – 18
Hookah 20 – 30
Hospital rooms 6 – 10
Kitchens (commercial) 15 -30
Kitchens ( residential ) 8 -14
Laundries 10 – 15
Libraries, public 5
Lunch Rooms 12 -15
Luncheonettes 12 -15
Nightclubs 20 – 30
Machine shops 6 – 12
Malls 6 – 10
Meat Processing 20-26
Medical Centers 8 – 12
Medical Clinics 8 – 12
Medical Offices 8 – 12
Mills, paper 15 – 20
Mills, textile general buildings 5
Mills, textile dye houses 15 – 20
Money Counting room 8 – 15
Municipal Buildings 5 – 10
Museums (Childrens) 12 -15
Museums / Galleries 10-14
Nail Salons 18 -24
Offices, public 5
Offices, private 5
Photo dark rooms 10 – 15
Pharmacy Prep 8 – 10
Pig houses 6 – 10
Pet Shops 12 – 14
Photo Studios 6 – 8
Police Stations 5 – 10
Post Offices 5 – 10
Poultry houses 6 – 10
Precision Manufacturing 10 – 50
Public Retail Stores 6 – 10
Pump rooms 5
Residences 4 – 6
Restaurants 8 – 12
Retail 6 – 10
School Classrooms 4 – 12
Shoe Shops 6 – 10
Shopping Centers 6 – 10
Shops, machine 5
Shops, paint 15 – 20
Shops, woodworking 5
Smoking Lounges 20-30
Substation, electric 5 – 10
Supermarkets 8 – 10
Swimming pools 20 – 30
Town Halls 5 – 10
Taverns (non smoking) 14-18
Taverns (Smoking) 20 – 30
Theaters 8 – 15
Transformer rooms 10 – 20
Turbine rooms, electric 5 – 10
Vape Shop 20 – 30
Warehouses 6 – 30
Waiting rooms, public 5
Welding Areas 12-16

Bowling Alleys
CFM per Person21-32

Type of Building and Room  OccupantCFM
  
  
AnimalsSheepCFM per Animal6
HorsesCFM per Animal85
HensCFM per Animal6
CowsCFM per Animal212
ChickensCFM per Animal4
Pigs, sowCFM per Animal127
PigletCFM per Animal32
Apartments CFM per Person32
Assembly halls CFM per Person21-32
Auditoriums CFM per Person21-32
BakeriesProductionCFM per Person32-42
Pastry roomCFM per Person32-42
BanksServiceCFM per Person21-32
ArchiveCFM per Person15-21
StaffCFM per Person21-32
Baths CFM per Person32
Barber Shops CFM per Person21-32
Bars CFM per Person32-42
Beauty Shops CFM per Person21-32
Bedrooms4 – 8
Cafeterias CFM per Person21-32
Cinemas/Theaters CFM per Person15-21
Chemist’s shopsSterile roomCFM per Person42-53
LaboratoryCFM per Person42-53
Packing roomCFM per Person21-32
StoreCFM per Person15-21
Churches CFM per Person21
Clubhouses CFM per Person32-42
Cocktail Lounges CFM per Person32-42
Computer Rooms CFM per Person21-32
Court Houses CFM per Person21-32
Dance halls CFM per Person32-42
Dental Clinics, Offices CFM per Person21-32
Department Stores (cfm/Sq.Ft) CFM per Person21-32
Dining Halls CFM per Person21-32
Drug Store CFM per Person21-32
Engine rooms CFM per Person21-32
Exhibition halls CFM per Person21-32
Fire Stations CFM per Person21-32
Garages CFM per Person21-32
HospitalsGeneralCFM per Person32
TherapyCFM per Person21-32
Operating theaterCFM per Person42-64
AutopsyCFM per Person32
HotelsReceptionCFM per Person32-42
RoomCFM per Person21-32
IndustriesFactoryCFM per Person21-42
Carpenter work shopCFM per Person21-32
Car repair shopCFM per Person21-32
Car repair shop, exhaust outletCFM per Car127-170
Mechanical work shopCFM per Person32-42
WeldingCFM per Person42
AssemblyCFM per Person21-32
Jails CFM per Person21-32
Jewelry Shop CFM per Person21-32
Libraries CFM per Person21-32
Lunch Rooms, Luncheonettes CFM per Person21-32
Municipal Buildings CFM per Person21-32
Museums CFM per Person21-32
Laundries CFM per Person32-42
Lavatories CFM per Person21
Night Clubs CFM per Person32-52
Malls CFM per Person21-32
Motels CFM per Person32-42
OfficesModuleCFM per Person21-42
LandscapeCFM per Person21-42
Conference roomCFM per Person62-64
Lecture roomCFM per Person21-42
Dining hallCFM per Person32-53
Staff, changing clothesCFM per Person21-32
Dining roomCFM per Person32
Resting roomCFM per Person32
Police Stations CFM per Person21-32
Post Offices CFM per Person21-32
Precision Manufacturing CFM per Person21-32
Restaurants CFM per Person21-32
Retail Stores (cfm/Sq.Ft) CFM per Person21-32
SchoolsClassroomCFM per Person21-32
Shops CFM per Person21-32
Shopping Centers CFM per Person21-32
Sports halls CFM per Person32-42
Supermarkets CFM per Person21
Swimming pools CFM per Person32
Taverns CFM per Person21-32
Town Halls CFM per Person21-32